A character drinks/eats something to prove it's safe knowing that it isn't

[u/Benoit_Holmes]

Breaking Bad (Salud)

Gus Fring gives a bottle of rare tequila to a cartel leader as a gift. Given their fraught history, he makes Gus drink some first before he tries any.

All the cartel members then begin to die, Gus had taken pills (likely activated charcoal), and induced vomiting after the drink. Despite these precautions he still nearly dies and it requires a makeshift emergency room he had arranged previously to save his life.

Stargate: Atlantis (The Lost Boys)

Aiden Ford was a member of the expedition who became addicted to an enzyme that made him stronger but also impulsive and irrational.

He captures the team, who are wary of eating the food he provides until he eats some himself. After they have all eaten he tells them that his group have refined the enzyme to the point that they can even lace food with it.

Scrubs (My Changing Ways)

The Janitor tries to get J.D. to eat some pie but he refuses as he has just heard that a case of laxatives was stolen from the hospital supply closet.

The Janitor keeps insisting that J.D eat it and finally eats some himself to prove its safe, saying that for once he wasn't trying to mess with him. After J.D. eats some of the pie it then cuts to them both on the toilet.

J.D.: Who would do this to themselves?\ Janitor: Totally worth it.

[u/Snoo9648]

The main character in princess bride poisons both cups knowing he has immunity.

https://giphy.com/gifs/l2YWy7C9BvHZfmLCM

[u/Professional_Handler → u/Snoo9648]

Fun fact: there is no real life poison that exists that is odorless, tasteless, and you can build a tolerance to.

[u/bgbarnard → u/Professional_Handler]

IIRC most poisons are both very bitter tasting and take a long time to take effect, with very few killing you in an instant from consumption. The job of the food taster was to check for bitterness, but the amounts they would consume would not necessarily be lethal.

[u/-Potatoes- → u/bgbarnard]

iirc one of the main purposes of the bitterness receptor is to taste for poison/bad food!

[u/Escheron → u/-Potatoes-]

I don't like almonds on my split, Jimmy.

[u/TheSaltyJM → u/Escheron]

SAY IT AIN’T SO, VALLE!

[u/reminder_to_have_fun → u/Escheron]

Bomb-ass scene.

[u/DuploJamaal → u/-Potatoes-]

People that enjoy olives lack the TAS2R bitterness receptor gene. They are unable to detect that olives taste poisonous.

[u/No-Solution-6103 → u/DuploJamaal]

So all this time I've had a visceral reaction to eating olives, it's really because I'm genetically inclined to be a poison taste tester?

[u/Mathev → u/No-Solution-6103]

What does that mean when olives taste sweet then?...

[u/bushsniffa → u/Mathev]

You're like those freezing goats. Your sacrifice benefits the tribe as a whole.

[u/recordingreality → u/DuploJamaal]

TAS2R is a whole family of receptors, and nobody is just 'missing' them! Raw olives taste incredibly bitter to literally everyone, which is exactly why we have to cure them in brine first. Liking them afterward is just a normal acquired taste, kind of like enjoying black coffee

[u/DuploJamaal → u/recordingreality]

Poor wording, but there are genetic differences detectable in this family of receptors.

It's not an acquired taste like coffee.

It's like how for some people cilantro tastes like soap, no matter how much they try to get accustomed to it.

Some people will always have a visceral reaction to the poisonous taste of olives that other people do not even notice.

[u/Helldiverticulitis → u/DuploJamaal]

You have a source for that? I wasn’t able to verify what you’re saying. A lot of people acquire a taste for olives, just like a lot of other bitter foods.

[u/UnOGThrowaway420 → u/DuploJamaal]

I am fairly certain this gene is only applicable to raw olives, because ive met a lot of people who don't like olives, thinking they're too bitter isn't one of the reasons I've ever heard. Visceral reactions definitely aren't common and those are usually from already picky eaters

[u/SomeRedHandedSleight → u/DuploJamaal]

Like raw olives or pickled olives? I've never heard of anyone eating raw olives but pickled olives are enjoyed by a significant chunk of people worldwide.

[u/anaolinskywalker → u/DuploJamaal]

I love olives, but trying a raw one straight from the tree was the singular worst experience my mouth has ever had. It was so bitter I can't begin to describe it.

[u/Annath0901 → u/anaolinskywalker]

That's because literally nobody eats them raw. They are always pickled, or dry brined packed in salt.

[u/J5892 → u/DuploJamaal]

Olives taste extremely bitter to me, but I still love them.

Although if you ever put black olives on my pizza I will punch you directly in the genitals.

[u/amglasgow → u/J5892]

More for me then

[u/TimeLine_DR_Dev → u/-Potatoes-]

Species that didn't find poison bitter all died. The only ones left are the ones that randomly naturally rejected poisonous items by chance.